Delta Symbol (Δ / δ) on Keyboard in Word/Excel

Delta is the Greek letter used a lot in math and science.

Δ (uppercase Delta) usually means “change in” (example: Δx, ΔT).
δ (lowercase delta) often means a small change (and sometimes shows up in calculus/physics).
People also confuse Δ with the triangle symbol △. They look similar, but △ is not a Greek letter.

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1-Minute Answer (fastest ways)

Copy/paste (works everywhere): Δ δ